WI: Tatars united in the 15th century

Basically, the question is, what would it mean to the Europe, East Slavs and Ottoman Empire, if the Tatars are still united, either through the survival of the Golden Horde or the quick reunification before most of them become smaller Khanate protectorates, throughout the 15th century and, optionally, beyond?

How would they retain or regain unity? How long would they survive? And what would be their ultimate fate, and why?
 
I'd say if the Tatars could reunite, all it would really take is drive and a particularly ambitious Khan in the Blue or White horde. From there I could easily see them becoming a Gunpowder Empire much in the same style as the Ottomans, the Safavids, and the Mughals. The potential for them to mix the same gunpowder tactics plus excellent use of light cavalry is there that the other three used when expanding.
 
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